a1=[1/3,pi/7,sqrt(5),pi+sqrt(5)]			
a2=sym([1/3,pi/7,sqrt(5),pi+sqrt(5)])		
a3=sym([1/3,pi/7,sqrt(5),pi+sqrt(5)],'e')	
a4=sym('[1/3,pi/7,sqrt(5),pi+sqrt(5)]')
